• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.45-50
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• 2008

Many applications of sensor network require connection to the Internet. The transmission protocol of traditional sensor network was designed within the sensor network itself. However, based on 6LoWPAN which can be accessed using IPv6, direct connection is possible between the sensor network and the TCP/IP network outside. Transmission of data in applications of sensor network falls into two main categories. One is a small packet that is periodically produced such as packet related to temperature and humidity. The other is a relatively large packet that brings about network overheads such as images. We investigated the conformance test and pros and cons of application data over the transmission protocol of Zigbee and 6LoWPAN. As a result, both Zigbee and 6LoWPAN have shown low rate of loss for periodic data and have in creased reliability of data transfer. When transmitting streaming image data, both ACK, non ACK mode of Zigbee and UDP of 6LoWPAN minimized transmission time but suffered the consequences of high packet loss. Even though TCP of 6LoWPAN required a long transmission time, we were able to confirm that no loss has occurred.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.3
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• pp.11-21
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• 2010

Increase in the number of sensor nodes in sensor networks and sensor node to automatically assign addresses are needed. The method developed to address existing severe wasting, coordinators have all address information, each sensor node when addressing the shortcomings are a lot of traffic. In this paper, 6LoWPAN automatically from the sensor nodes capable of efficiently addressing Hop-Count based hierarchical address allocation algorithm is proposed. How to propose a hop-count of divided areas are separated, with no overlap and can be assigned a unique address, DAD(Duplicate Address Detection) reduced area. Perform DAD to reduce traffic, packet transmission in the IP header destination address, respectively, with a minimum 32-bit compression and packet transmission over a non-compression method to reduce the number of 11.1%.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.705-706
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• 2008

The feature of 6LoWPAN is the capability of the dynamic assignment of 16bit short addresses. By using this dynamically assigned short address, a hierarchical routing is employed. In case of node failure, this hierarchical routing don't support a technique for path recovery. So, this paper proposes the path recovery technique for hierarchical routing over 6LoWPAN.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.296-296
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• 2006

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.2
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• pp.1070-1088
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• 2017

Recently, the applications of Internet of Things (IoTs) are growing rapidly. Wireless Sensor Network (WSN) becomes an emerging technology to provide the low power wireless connectivity for IoTs. The IPv6 over low-power wireless personal area networks (6LoWPAN) has been proposed by IETF, which gives each WSN device an IPv6 address to connect with the Internet. The transmission congestion in IoTs could be a problem when a large numbers of sensors are deployed in the field. Therefore, it is important to consider whether the WSN devices have be completely integrated into the Internet with proper quality of service (QoS) requirements. The Software Defined Network (SDN) is a new architecture of network decoupling the data and control planes, and using the logical centralized control to manage the forwarding issues in large-scale networks. In this research, the SDN-based 6LoWPAN Border Router (6LBR) is proposed to integrate the transmission from WSNs to Internet. The proposed SDN-based 6LBR communicating between WSNs and the Internet will bring forward the requirements of end-to-end QoS with bandwidth guarantee. Based on our experimental results, we have observed that the selected 6LoWPAN traffic flows achieve lower packet loss rate in the Internet. Therefore, the 6LoWPAN traffic flows classified by SDN-based 6LBR can be reserved for the required bandwidth in the Internet to meet the QoS requirements.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.15-23
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• 2020

As the IoT industry expands, various application services based on location information of devices are released. In order to transmit the location information, various wireless communication technologies such as Bluetooth and Wi-Fi are used. However, these technologies have limited coverage, and cellular networks with relatively wide coverage have the disadvantage of paying for use. In this paper, we implemented our own location information system using LoRa, a low power long distance wireless communication technology. As a result, no cost is incurred and it has relatively wider coverage than other wireless communication technologies using LoRa technology. The implementation system enables LoRa communication based on IPv6 using CoAP and 6LoWPAN, and enables multiple devices to interwork with the existing Internet environment.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.4
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• pp.1819-1831
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• 2018

This paper focuses on a header compression method for the Authentication Header (AH) and Encapsulation Security Payload (ESP) for application to 6LoWPAN. Based on the context, an extendible compression method is developed by analysing each field of the AH and ESP. The method is carried out by resetting the AH and ESP header compression formats, adding a MOD field, and setting different working modes. Authentication, encryption, and a mixture of certification and encryption are provided as flexible options. In addition, the value of the original IPv6 extensible header ID (EID) field can be retained, while the number of occupied NHC_ID values can be decreased for future extendibility. The experimental results show the feasibility and validity of the current compression method. By comparison with other solutions, the new mechanism is demonstrated to be advantageous in terms of compression ratio, flexibility and extendibility.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.247-251
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• 2007

이 논문에서는 기존의 기상관측 시스템인 AWS에 IP-USN 기술 중 하나인 6LoWPAN을 적용하여 대체 개발한 시스템의 구조, 결과 그리고 문제점 분석 내용을 주로 다루고 있다. IP-USN이 적용된 이번 시스템에서는 기존의 IPv4 및 IPv6 인프라와 상호운용 가능하며, 저렴한 개발 비용과 손쉬운 설치 방법으로 기존의 AWS 시스템과 동일한 성능을 보여주었으며, 하나의 AWS와는 달리 넓은 지역을 효과적으로 관측 할 수 있어 수집된 데이터 평균값에 신뢰도를 높여주었다. 그러나, IP-USN 기술을 적용하면서 여러 문제점이 발생하였고, 이를 분석 및 향후 과제를 위한 방법을 제시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.1-3
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• 2012

최근 들어 빌딩에 대해 단순이 이용 가능한 공간이 아닌 IP기반의 센서를 이용한 빌딩 자동화 연구가 활발히 진행 되고 있다. IP 기반의 센서는 기존의 빌딩 내 IT 인프라에 쉽게 적용 가능 하며, 무선기술을 이용한 빌딩 내 센서 배치가 용이하다. IP 기반 센서는 6LoWPAN, Zigbee 등이 있으며, IETF의 표준화 기술인 6LoWPAN이 선호 되고 있다. 본 논문에서는 빌딩 내 무선 센서네트워크 설계를 위해 6LoWPAN 응용계층의 CoAP 그룹통신 기술을 이용 하여 빌딩 내트워크 설계 연구를 소개 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.721-724
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• 2010

6LoWPAN 에서의 부트스트래핑 과정은 네트워크 참여시 인증 절차를 반복적으로 수행하여 이동성을 보장하기에 적합하지 못하다. 본 논문에서는 이러한 반복적 인증 절차를 최소화 시켜는 방안을 제안한다. 또한 제안된 방안을 통하여서 네트워크 참여시 지연의 최소화를 기대한다.